int l = 13;
int l2 = 12;
int l3 = 11;
int l4 = 10;

int b = 1;
int b2 = 2;
int b3 = 3;
int b4 = 4;

void setup(){
    pinMode(l,OUTPUT);
    pinMode(l2,OUTPUT);
    pinMode(l3,OUTPUT);
    pinMode(l4,OUTPUT);

    pinMode(b,INPUT_PULLUP);
    pinMode(b2,INPUT_PULLUP);
    pinMode(b3,INPUT_PULLUP);
    pinMode(b4,INPUT_PULLUP);
}

void loop(){
    int bd = digitalRead(1);
    int b2d = digitalRead(2);
    int b3d = digitalRead(3);
    int b4d = digitalRead(4);
    if (bd == LOW){
        digitalWrite(l, HIGH);
    }else{
        digitalWrite(l,LOW);
    }
    if (b2d == LOW){
        digitalWrite(l2, HIGH);
    }else{
        digitalWrite(l2,LOW);
    }
    if (b3d == LOW){
        digitalWrite(l3, HIGH);
    }else{
        digitalWrite(l3,LOW);
    }
    if (b4d == LOW){
        digitalWrite(l, HIGH);
    }else{
        digitalWrite(l,LOW);
    }
    if (b4d == LOW){
        digitalWrite(l2, HIGH);
    }else{
        digitalWrite(l2,LOW);
    }
    if (b4d == LOW){
        digitalWrite(l3, HIGH);
    }else{
        digitalWrite(l3,LOW);
    }
    if (b4d == LOW){
        digitalWrite(l4, HIGH);
    }else{
        digitalWrite(l4,LOW);
    }
}